Antenna



FIG. 1 is a front perspective view of an antenna showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top plan view thereof;

FIG. 7 is a bottom plan view thereof; and,

FIG. 8 is a rear perspective view thereof.

The broken lines in the drawings depict portions of the antenna that form no part of the claimed design. 

CLAIM The ornamental design for an antenna, as shown and described. 